本文旨在研製高效率、低電壓、大電流的直流功率轉換器，用於微處理器的電源供給。除電路架構採用三臂型同步直流降壓轉換器外，亦考量同步整流器上臂及下臂盲時的最佳化設定，以提高效率、分開散熱面積且降低輸出電壓漣波。此外，文中提出三臂型轉換器均溫控制策略及藉電感直流電阻，完成電流偵測、調整每臂之平均溫度，並相對地調節每臂間負載電流，提高整體轉換器效率與可靠性。
本文依據額定輸出電流45A ,單臂輸出端選用0.36µH電感及6顆470µF電容，以最低元件成本達成電路規格需求。本文轉換器的輸入及輸出電壓分別為12V 與 1.8V ; 輸出電壓漣波低於2%，實測效率最高為91.3%。每一臂間功率元件的電流差值，均控制小於5%範圍，實現了功率轉換器各臂間溫昇平衡的目標。

This thesis is targeted to realize a high efficiency, low voltage and heavy current dc converter for the power supply of microprocessors. Adopting the architecture of three-arm type synchronous dc buck converter and optimizing the dead-time setting between upper and lower MOSFETs in synchronous rectifier, one can improve the efficiency, distribute heating area and reduce output ripple voltage. By using three-arm converter average thermal control strategy and thermal-compensated dc resistance of inductor, one can complete current sensing in order to adjust average temperature and load current of each arm, which therefore enhance the performance and reliabilty of the converter.
Based on the rated output current of 45A, single-arm output inductor of 0.36μH and six 470μF output capacitors are selected to meet the circuit specification with minimum component cost. The proposed power converter has its input and output voltages of 12V and 1.8V, respectively, with a rated output current of 45A. The operating frequency is 300 kHz and the frequency of output current filter is 900 kHz. The output voltage ripple is less than 2%, while the highest efficiency measured is 0.913. Current differences between any two arms are kept within 5%, assuring thermal balance of the dc power converter arms.

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